Mike, I'd suggest that the reason you could tell no difference was that there isn't any. You don't mention how large your CD collection is, but I would never consider a single disc player; the convenience of a changer is just too great and there's no difference in the sound quality. Consider at least the five disc players such as the Denon and HK, but my suggestion for a large collection would be a 300-400 disc changer such as the Sony.

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Enjoy the music, not the equipment.